[Part 2] Fetch epics for Roadmap via Vuex
What does this MR do?
Adds support fetching epics in Roadmap via Vuex actions and mutations.
Does this MR meet the acceptance criteria?
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Tests added for this feature/bug -
Tested in all supported browsers -
Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides (https://about.gitlab.com/handbook/engineering/quality/guidelines/test-engineering/). -
EE specific content should be in the top level /ee
folder
Closes #9831 (closed)
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